Index: uspace/lib/libc/include/thread.h
===================================================================
--- uspace/lib/libc/include/thread.h	(revision 116d3f6f655456c410fc698142213ee6eceee904)
+++ uspace/lib/libc/include/thread.h	(revision b2a0f6dd248c7087970e96feec1c1747a97636bb)
@@ -42,4 +42,6 @@
 typedef uint64_t thread_id_t;
 
+extern char _tls_alignment;
+
 extern void __thread_entry(void);
 extern void __thread_main(uspace_arg_t *uarg);